// 实现这个项目的构建任务
const { series, parallel, src, dest, watch } = require('gulp');
const loadPlugins = require('gulp-load-plugins');
const browserSync = require('browser-sync');
const del = require('del');

const plugins = loadPlugins();
const bs = browserSync.create();

const clean = () => {
  return del(['dist', 'temp']);
};

const style = () => {
  return src('src/assets/styles/*.scss', { base: 'src' })
    .pipe(plugins.sass({ outputStyle: 'expanded' }))
    .pipe(dest('temp'));
};

const script = () => {
  return src('src/assets/scripts/*.js', { base: 'src' })
    .pipe(plugins.babel({ presets: ['@babel/preset-env'] }))
    .pipe(dest('temp'));
};

const page = () => {
  return src('src/*.html', { base: 'src' })
    .pipe(plugins.swig())
    .pipe(dest('temp'));
};
const jsLint = () => {
  return src('src/assets/script/*.js')
    .pipe(plugins.eslint())
    .pipe(plugins.eslint.format())
    .pipe(plugins.eslint.failAfterError());
};

const cssLint = () => {
  return src('src/assets/styles/*.scss')
    .pipe(plugins.scssLint())
};

const image = () => {
  return src('src/assets/images/**', { base: 'src' })
    .pipe(plugins.imagemin())
    .pipe(dest('dist'));
};

const font = () => {
  return src('src/assets/fonts/**', { base: 'src' })
    .pipe(plugins.imagemin())
    .pipe(dest('dist'));
};

const extra = () => {
  return src('public/**', { base: 'public' })
    .pipe(dest('dist'));
};

const serve = () => {
  watch('src/assets/styles/*.scss', style);
  watch('src/assets/scripts/*.js', script);
  watch('src/*.html', page);
  watch([
    'src/assets/images/**',
    'src/assets/fonts/**',
    'public/**',
  ], bs.reload);

  bs.init({
    notify: false,
    files: 'dist/**',
    server: {
      baseDir: ['temp', 'src', 'public'],
      routes: {
        '/node_modules': 'node_modules',
      },
    },
  });
};

const upload = () => {
  return src('dist')
    .pipe(plugins.deployFtp({
      remotePath: '/tmp',
      host: 'localhost',
    }));
}

const useref = () => {
  return src('temp/*.html', { base: 'temp' })
    .pipe(plugins.useref({ searchPath: ['temp', '.'] }))
    .pipe(plugins.if(/\.js$/, plugins.uglify()))
    .pipe(plugins.if(/\.css$/, plugins.cleanCss()))
    .pipe(plugins.if(/\.html$/, plugins.htmlmin({
      collapseWhitespace: true,
      minifyCSS: true,
      minifyJS: true,
    })))
    .pipe(dest('dist'));
};

const compile = parallel(style, script, page);

const build = series(
  clean,
  parallel(
    series(compile, useref),
    image,
    font,
    extra,
  )
);
const lint = parallel(jsLint, cssLint);
const start = series(compile, serve);
const deploy = series(build, upload);

module.exports = {
  build,
  serve,
  start,
  clean,
  deploy,
  lint,
};
